Make a commitment to your health with the American Heart Association’s National Walking Day, a short rally with giveaways, free blood-pressure checks, healthful snacks, exercise demonstrations and more, noon Wednesday at Fifth Avenue and University Street, Seattle, followed by a 1.28-mile walk around downtown. Or join National Walking Day’s South Sound event, 11:30 a.m. Wednesday, Wright Park, 501 S. I St., Tacoma; free (